393 lines
13 KiB
Python
393 lines
13 KiB
Python
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# -*- coding: utf-8 -*-
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""" Basic SQL DB client """
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import logging
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log = logging.getLogger(__name__)
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#
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# Exceptions
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#
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class DBException(Exception):
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""" That is the base exception class for all the other exceptions provided by this module. """
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def __init__(self, error, *args, **kwargs):
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for arg, value in kwargs.items():
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setattr(self, arg, value)
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super().__init__(error.format(*args, **kwargs))
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class DBNotImplemented(DBException, RuntimeError):
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"""
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Raised when calling a method not implemented in child class
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"""
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def __init__(self, method, class_name):
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super().__init__(
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"The method {method} is not yet implemented in class {class_name}",
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method=method, class_name=class_name
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)
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class DBFailToConnect(DBException, RuntimeError):
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"""
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Raised on connecting error occurred
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"""
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def __init__(self, uri):
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super().__init__(
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"An error occured during database connection ({uri})",
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uri=uri
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)
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class DBDuplicatedSQLParameter(DBException, KeyError):
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"""
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Raised when trying to set a SQL query parameter
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and an other parameter with the same name is already set
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"""
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def __init__(self, parameter_name):
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super().__init__(
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"Duplicated SQL parameter '{parameter_name}'",
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parameter_name=parameter_name
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)
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class DBUnsupportedWHEREClauses(DBException, TypeError):
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"""
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Raised when trying to execute query with unsupported
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WHERE clauses provided
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"""
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def __init__(self, where_clauses):
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super().__init__(
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"Unsupported WHERE clauses: {where_clauses}",
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where_clauses=where_clauses
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)
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class DBInvalidOrderByClause(DBException, TypeError):
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"""
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Raised when trying to select on table with invalid
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ORDER BY clause provided
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"""
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def __init__(self, order_by):
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super().__init__(
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"Invalid ORDER BY clause: {order_by}. Must be a string or a list of two values (ordering field name and direction)",
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order_by=order_by
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)
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class DB:
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""" Database client """
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just_try = False
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def __init__(self, just_try=False, **kwargs):
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self.just_try = just_try
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self._conn = None
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for arg, value in kwargs.items():
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setattr(self, f'_{arg}', value)
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def connect(self, exit_on_error=True):
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""" Connect to DB server """
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raise DBNotImplemented('connect', self.__class__.__name__)
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def close(self):
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""" Close connection with DB server (if opened) """
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if self._conn:
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self._conn.close()
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self._conn = None
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@staticmethod
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def _log_query(sql, params):
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log.debug(
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'Run SQL query "%s" %s',
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sql,
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"with params = {0}".format( # pylint: disable=consider-using-f-string
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', '.join([
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f'{key} = {value}'
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for key, value in params.items()
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]) if params else "without params"
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)
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)
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@staticmethod
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def _log_query_exception(sql, params):
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log.exception(
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'Error during SQL query "%s" %s',
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sql,
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"with params = {0}".format( # pylint: disable=consider-using-f-string
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', '.join([
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f'{key} = {value}'
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for key, value in params.items()
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]) if params else "without params"
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)
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)
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def doSQL(self, sql, params=None):
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"""
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Run SQL query and commit changes (rollback on error)
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:param sql: The SQL query
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:param params: The SQL query's parameters as dict (optional)
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:return: True on success, False otherwise
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:rtype: bool
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"""
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raise DBNotImplemented('doSQL', self.__class__.__name__)
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def doSelect(self, sql, params=None):
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"""
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Run SELECT SQL query and return list of selected rows as dict
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:param sql: The SQL query
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:param params: The SQL query's parameters as dict (optional)
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:return: List of selected rows as dict on success, False otherwise
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:rtype: list, bool
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"""
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raise DBNotImplemented('doSelect', self.__class__.__name__)
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#
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# SQL helpers
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#
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@staticmethod
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def _quote_table_name(table):
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""" Quote table name """
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return '"{0}"'.format( # pylint: disable=consider-using-f-string
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'"."'.join(
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table.split('.')
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)
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)
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@staticmethod
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def _quote_field_name(field):
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""" Quote table name """
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return f'"{field}"'
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@staticmethod
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def format_param(param):
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""" Format SQL query parameter for prepared query """
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return f'%({param})s'
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@classmethod
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def _combine_params(cls, params, to_add=None, **kwargs):
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if to_add:
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assert isinstance(to_add, dict), "to_add must be a dict or None"
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params = cls._combine_params(params, **to_add)
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for param, value in kwargs.items():
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if param in params:
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raise DBDuplicatedSQLParameter(param)
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params[param] = value
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return params
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@classmethod
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def _format_where_clauses(cls, where_clauses, params=None, where_op=None):
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"""
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Format WHERE clauses
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:param where_clauses: The WHERE clauses. Could be:
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- a raw SQL WHERE clause as string
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- a tuple of two elements: a raw WHERE clause and its parameters as dict
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- a dict of WHERE clauses with field name as key and WHERE clause value as value
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- a list of any of previous valid WHERE clauses
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:param params: Dict of other already set SQL query parameters (optional)
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:param where_op: SQL operator used to combine WHERE clauses together (optional, default: AND)
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:return: A tuple of two elements: raw SQL WHERE combined clauses and parameters on success
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:rtype: string, bool
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"""
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if params is None:
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params = {}
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if where_op is None:
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where_op = 'AND'
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if isinstance(where_clauses, str):
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return (where_clauses, params)
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if isinstance(where_clauses, tuple) and len(where_clauses) == 2 and isinstance(where_clauses[1], dict):
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cls._combine_params(params, where_clauses[1])
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return (where_clauses[0], params)
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if isinstance(where_clauses, (list, tuple)):
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sql_where_clauses = []
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for where_clause in where_clauses:
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sql2, params = cls._format_where_clauses(where_clause, params=params, where_op=where_op)
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sql_where_clauses.append(sql2)
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return (
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f' {where_op} '.join(sql_where_clauses),
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params
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)
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if isinstance(where_clauses, dict):
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sql_where_clauses = []
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for field, value in where_clauses.items():
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param = field
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if field in params:
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idx = 1
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while param in params:
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param = f'{field}_{idx}'
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idx += 1
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cls._combine_params(params, {param: value})
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sql_where_clauses.append(
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f'{cls._quote_field_name(field)} = {cls.format_param(param)}'
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)
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return (
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f' {where_op} '.join(sql_where_clauses),
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params
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)
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raise DBUnsupportedWHEREClauses(where_clauses)
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@classmethod
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def _add_where_clauses(cls, sql, params, where_clauses, where_op=None):
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"""
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Add WHERE clauses to an SQL query
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:param sql: The SQL query to complete
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:param params: The dict of parameters of the SQL query to complete
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:param where_clauses: The WHERE clause (see _format_where_clauses())
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:param where_op: SQL operator used to combine WHERE clauses together (optional, default: see _format_where_clauses())
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:return:
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:rtype: A tuple of two elements: raw SQL WHERE combined clauses and parameters
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"""
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if where_clauses:
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sql_where, params = cls._format_where_clauses(where_clauses, params=params, where_op=where_op)
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sql += " WHERE " + sql_where
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return (sql, params)
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def insert(self, table, values, just_try=False):
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""" Run INSERT SQL query """
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# pylint: disable=consider-using-f-string
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sql = 'INSERT INTO {0} ({1}) VALUES ({2})'.format(
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self._quote_table_name(table),
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', '.join([
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self._quote_field_name(field)
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for field in values.keys()
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]),
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", ".join([
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self.format_param(key)
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for key in values
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])
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)
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if just_try:
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log.debug("Just-try mode: execute INSERT query: %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql, params=values):
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log.error("Fail to execute INSERT query (SQL: %s)", sql)
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return False
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return True
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def update(self, table, values, where_clauses, where_op=None, just_try=False):
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""" Run UPDATE SQL query """
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# pylint: disable=consider-using-f-string
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sql = 'UPDATE {0} SET {1}'.format(
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self._quote_table_name(table),
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", ".join([
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f'{self._quote_field_name(key)} = {self.format_param(key)}'
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for key in values
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])
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)
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params = values
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try:
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sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
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except (DBDuplicatedSQLParameter, DBUnsupportedWHEREClauses):
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log.error('Fail to add WHERE clauses', exc_info=True)
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return False
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if just_try:
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log.debug("Just-try mode: execute UPDATE query: %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql, params=params):
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log.error("Fail to execute UPDATE query (SQL: %s)", sql)
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return False
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return True
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def delete(self, table, where_clauses, where_op='AND', just_try=False):
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""" Run DELETE SQL query """
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sql = f'DELETE FROM {self._quote_table_name(table)}'
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params = {}
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try:
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sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
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except (DBDuplicatedSQLParameter, DBUnsupportedWHEREClauses):
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log.error('Fail to add WHERE clauses', exc_info=True)
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return False
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if just_try:
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log.debug("Just-try mode: execute UPDATE query: %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql, params=params):
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log.error("Fail to execute UPDATE query (SQL: %s)", sql)
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return False
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return True
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def truncate(self, table, just_try=False):
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""" Run TRUNCATE SQL query """
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sql = f'TRUNCATE TABLE {self._quote_table_name(table)}'
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if just_try:
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log.debug("Just-try mode: execute TRUNCATE query: %s", sql)
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return True
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log.debug(sql)
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if not self.doSQL(sql):
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log.error("Fail to execute TRUNCATE query (SQL: %s)", sql)
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return False
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return True
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def select(self, table, where_clauses=None, fields=None, where_op='AND', order_by=None, just_try=False):
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""" Run SELECT SQL query """
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sql = "SELECT "
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if fields is None:
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sql += "*"
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elif isinstance(fields, str):
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sql += f'{self._quote_field_name(fields)}'
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else:
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sql += ', '.join([self._quote_field_name(field) for field in fields])
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sql += f' FROM {self._quote_table_name(table)}'
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params = {}
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try:
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sql, params = self._add_where_clauses(sql, params, where_clauses, where_op=where_op)
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except (DBDuplicatedSQLParameter, DBUnsupportedWHEREClauses):
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log.error('Fail to add WHERE clauses', exc_info=True)
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return False
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if order_by:
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if isinstance(order_by, str):
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sql += f' ORDER BY {order_by}'
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elif (
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isinstance(order_by, (list, tuple)) and len(order_by) == 2
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and isinstance(order_by[0], str)
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and isinstance(order_by[1], str)
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and order_by[1].upper() in ('ASC', 'UPPER')
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):
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sql += f' ORDER BY "{order_by[0]}" {order_by[1].upper()}'
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else:
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raise DBInvalidOrderByClause(order_by)
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if just_try:
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log.debug("Just-try mode: execute SELECT query : %s", sql)
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return just_try
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|
|
return self.doSelect(sql, params=params)
|